Steam cleaner for preheaters



July 14,- 1931. i 1'. G. HGLUND smul CLEANER rfon v Pmm'rnas ruga Novffu.- 1921 4 Patented July 14, 1931 UNITED STATES PATE Nr oli-*Fica THUBE GUSTAF HGLUND, OF STOCKHOLM, SWEDEN, ASSIGNOR TO AKTIEBOLAGET SUPERIOR, OF STOCKHOLM, SlEDlllNl f STEAM CLEANER FOR 'PREHEATERS Application led November 15, 1927, Serial Nc."233,456, and in Sweden October 27, 1925.

This relates to improvements in apparatus for cleaning air or gas preheaters of the type in which the heat transmitting parts are movable, e. g. that t pe of preheater which is constructed by Ljungstrm. These preheaters consist of a certain number of vertical plates fixed to a slowly rotating shaft and so arranged that the plates during one half of a revolution will pass through the liuc and during the other half of a revolution will be exposed to the air that is to be preheated. During the first named period the plates will be. preheated by the flue gases, While during the second period the plates will deliver to the air the heat absorbed from the flue gases. Both for the heat absorption and for the heat delivery it is, ofcourse, essential that the metal surfaces then in action be as free as possible from soot, as a soot 2u layer is in a high degree insulating in effect.

Y The invention has for its object to effect improvements over known apparatus which have previously been provided with a fixed steam tube having several steam nozzles.

According to the present invention these steam nozzles, which in a` known manner are so formed that the escaping steam will be fan shaped, are so placed that the fan shaped steam jets will be arranged in different planes all of which are approximately parallel, and

at such a distance from one another that adjacent parts of the steam jets partly ycover one another if the jets are viewed in the moving direction of the heat transmitting parts,

but without in reality cutting one another.

The object of the said arrangement of the nozzles is that at the outermost parts of the fan shaped steam jets, which outermost parts 7 are the least eective for removing soot, the 4.0 heat transmitting plates will be caused'to be twice treated by the steam jets.

In the accompanying drawings an embodiment of my invention is shown as adapted to a Ljungstrm air preheater and in which Fig. l is a. cross section of the undermost part of the air preheater with the steam cleaning apparatus mounted therein, and Fig. 2 is a horizontal section of the same showing the arrangement of the steam nozzles. That part of the preheater which is designated at l, is that vin which the flue gases enter the apparatus, lwhile l2 designates that part of the preheater which is placed in the Way of the airpthat is to be preheated. In the part 1 is arranged below the plates of the preheater a substantially horizontal tube 2 provided Vwith a number of nozzles 3. These nozzles are so formed that the escaping steam will be spread fan like in a relatively thin jet. According to the present invention these nozzles are so arranged that the escaping, fan

like steam jets are turned at an angle to the axis of the tube 2 so as not to cut one another, but partly overlap one another lto some extent so that the adjacent parts of the steam jets will hit the same spot of the heat transmitting plates. Y Y

As shown in the drawings, the nozzles 3 are so spaced that the distance between them is greater nearest to the shaft 4 of the preheater and Y successively diminishes toward the periphery or toward the cylindrical shell 5 of the preheater. As the tube 2 is arranged radially to the vertical plates between the shaft 4 and the shell 5, the nozzles are so arranged that the quantity of steam necessary for cleaning the plates from soot will be proportional, or nearly so, to the peripherical velocity, which increases from the center to the shell. This cleaningaction will be about the same at the periphery as at the shaft.

In the embodiment shown in the drawings the `tube 2 is at the innermost end shown mounted by means of a tap 6 which, however, only will form a simple means for holding the tube 2 in its place, but will not serve as a journal, as the tube 2 is fixed to the shell by means of a bolted llange 8. The steam is regulated by means of the valve 9, and to cause the apparatus to work it is only necessary to open this valve. llhen repairing or inspecting the tube 2 and its nozzles 3 it is only necessary to dismount the valve 9 and to unscrew the bolts of the flange V8. Thereafter the tube 2 may be withdrawn. `When the repair is completed the tube 2 is simply inserted through the opening in the shell 7 in such a manner that the tap 6 will engage the recess 10 and thereby secure the tube 1n the part 1. Y

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The invention is not limited to the embodiment hereinbefore described as applied to a special sort of preheater, but may also be used at other similar apparatus where the heat transmitting surface exposed to soot deposition is movable in one' manner or an,- other so that the said principle may be used.

Vhat I claim as new and desire to secure by Letters Patent of the United States of America is Soot blowing apparatus of the. class described, comprising a revoluble element having vertically arranged heat transmitting platesmounted thereon and carried thereby, and a lixed steam tube located below and disposed substantially radially with reference to said revoluble element, said tube having nozzles arranged to discharge jets of steam upwardly against andv between the plates, said nozzles having such a shape as to emit a substantially fan shaped steam jet, and said nozzles being so spaced relatively to each other and so disposed relatively to the radial. direction of said steam tube that the emitted steam jets are at an angle to said radial direction and overlap each other in said radial. direction without touching each other.

Intestimony whereof I ailix my signature.

THURE Gusi-AF-HGLUND. 

